CBO's scoring provided a boost to the momentum, but Democrats still need to iron out key differences among the various bills. The CBO analysis concluded the Baucus measure would come in under budget at $829 billion, and would expand coverage to 94 percent of eligible Americans.

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Senate Majority Leader Harry Reid, D-Nev., said today the Finance Committee will vote on Baucus' bill next Tuesday. If the bill passes, it would need to be interwoven with the bill passed by the Senate Health, Education, Labor and Pensions Committee, and that means legislation will likely not be on the Senate floor until the week after next, at the earliest.

Meanwhile, House Democrats are working to marry the three different pieces of legislation. Once they are complete, both Senate and House bills will have to be merged for a full vote.

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House Democratic leaders want to wait for the Senate to act before bringing a bill to the floor. In the meantime, they have to bring on board fiscally conservative Blue Dog Democrats, who have expressed reservations about the cost of the bills, each of which is estimated to cost more than $1 trillion over the next 10 years.

Today, Speaker of the House Nancy Pelosi, D-Calif., expressed optimism about the direction of discussions but wouldn't comment on how the mechanics would play out once there was a single bill from House Democrats.

"This is not about whether you have the votes. This is about what does the job for the American people in the most fiscally sound way," Pelosi told reporters today.

"There will be the votes for a public option and now it's a question of which one," Pelosi said.

But despite House Democrats' insistence that a public option be included, Senate Democrats are still divided on the idea. The Health, Education, Labor and Pensions Committee has included the provision in its bill, but Baucus' proposal instead calls for the creation of nonprofit health care insurance cooperatives as an alternative.

However, the CBO analysis, released Wednesday, suggested that co-ops aren't much of an alternative to what is currently being offered.

"The proposed co-ops had very little effect on the estimates," the CBO report said, because "they seem unlikely to establish a significant market presence in many areas of the country or to noticeably affect federal subsidy payments."

That analysis is likely to create rifts between Baucus and his colleagues, many of whom are insisting on a public option.

Another proposal being discussed in the House is a windfall profit tax on insurance companies. Some Democrats say such a tax might help pay for overhauling the system.

Pelosi said the idea is being discussed but that it's still "preliminary."

"They [insurance companies] are going to get 50 million new consumers, many of them subsidized by the taxpayers, and we think they can put more on the table," she told reporters.

Democrats Divided

Republicans downplayed the relative low cost and deficit neutrality of the Baucus bill as "irrelevant." Sen. Mitch McConnell, R-Ky., even suggested that "it'll never see the light of day."